221163704420 has 24 divisors (see below), whose sum is σ = 464689726200. Its totient is φ = 88418634752.

The previous prime is 221163704389. The next prime is 221163704459. The reversal of 221163704420 is 24407361122.

It can be written as a sum of positive squares in 4 ways, for example, as 83094980644 + 138068723776 = 288262^2 + 371576^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2889215 + ... + 2964774.

It is an arithmetic number, because the mean of its divisors is an integer number (19362071925).

Almost surely, 2^221163704420 is an apocalyptic number.

221163704420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221163704420 is an abundant number, since it is smaller than the sum of its proper divisors (243526021780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221163704420 is a wasteful number, since it uses less digits than its factorization.

221163704420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855887 (or 5855885 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The spelling of 221163704420 in words is "two hundred twenty-one billion, one hundred sixty-three million, seven hundred four thousand, four hundred twenty".